Speaking ahead of Chelsea’s second match of the group stage, Mourinho said: “What has to change? The attitude of the players, because in the first half against Newcastle it was really poor.

“Six of them were walking on the pitch, six of them were looking to the opponents moving the ball and just playing comfortably in their areas. When they got the ball it was slow thinking, slow decisions — that has to change. If it doesn’t change, we will lose in Porto, for sure, because they are a better team than Newcastle.”

Ramires and Willian, who came off the bench late on to score Chelsea’s goals, look certain to be in the first XI after proving they have fully recovered from minor injuries, while Diego Costa is expected to return as his ban doesn’t extend to Europe. Captain John Terry, Ruben Loftus-Cheek, John Obi Mikel, Kenedy and Abdul Baba Rahman are also under consideration.

Mourinho added: “Nothing changed at half-time, it turned on the changes. Ramires and Willian changed the game, not just for their goals but their aggressive play, the pressure in midfield, the quick thinking, the running forward of Ramires, the movement of Willian.”

Meanwhile, defender Gary Cahill has revealed he will have a scan on his broken nose next week to discover if he can stop wearing a face mask.